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Calibre maintains a list of "known" suffixes to use when creating the Author_Sort string. You simply need to add to the list so that it recognizes the roman numeral suffix "IV", along with others. The list is maintained in the Tweaks section of Preferences under the "Author sort name algorithm" heading.
You can also manually correct the Author_Sort value in the Edit Metadata dialog or globally for a particular author by editing the author's name entry in the Tags window.
I added several including "Pere" and "Fils" as they are the French for "Senior" and "Junior" so that the two Alexander Dumas sort correctly.
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